Facing a raw edge is a really great alternative to using a binding. I have also used these techniques in my girls’ blouses. They are similar to bias binding but they are completely on the wrong side of the fabric instead of being around the edge.
Facing A Seamless Neck Opening.
Cut a rectangle or square of facing fabric. If you are using interfacing, cut it to the same size and attach it to the wrong side of the fabric. Neaten the edges with a zigzag stitch. Place and pin it onto your fabric with right sides together and draw a line to show where your opening is going to be.
Stitching really close to the line, sew down its length, across the bottom and back up the other side. Cut along your drawn line, clip into the corners and turn to the wrong side. Iron and top sew the edging if needed.
The dark coloured fabric I used so that you can see it easily does not do this technique justice. It is really effective when you use the same fabric for the facing.
Using Bias Binding As A Facing.
Pin the bias binding to the right side of the neckline, armhole or hem. Sew along the first crease. Turn the whole strip of facing to the inside and top sew along the bottom edge.
Again, this looks a lot better when you haven’t got a dark colour showing through your fabric.